linux 发送自定义信号

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <pid>\n", argv[0]);
        exit(1);
    }

    int pid = atoi(argv[1]);
    int sig = SIGUSR1; // 使用SIGUSR1作为自定义信号

    if (kill(pid, sig) == -1) {
        perror("kill");
        exit(1);
    }

    printf("Signal %d sent to process %d\n", sig, pid);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>

void handle_signal(int sig) {
    printf("Received signal %d\n", sig);
}

int main() {
    struct sigaction sa;
    sa.sa_handler = handle_signal;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = 0;

    if (sigaction(SIGUSR1, &sa, NULL) == -1) {
        perror("sigaction");
        exit(1);
    }

    printf("Waiting for signals...\n");
    while (1) {
        sleep(1); // 保持进程运行
    }

    return 0;
}